c Assumes 55% city and 45% highway-miles. The source calculated
average miles per gallon for light-duty vehicles by taking the reciprocal of
the sales-weighted average of gallons per mile. This is called the harmonic
average. These data were then converted to metric units.

d Beginning with FY 1999, the total Light truck fleet ceased to be categorized by either
domestic or import fleets.

e No combined figure is available for 1980. In 1980, CAFE
standard for 2 wheel drive, and 4 wheel drive light trucks were 6.8, and 6.0
kmpl respectively.

NOTES

Data for 2007-09 were calculated using a new
methodology developed by FHWA. Data for these years are based on new
categories and are not comparable to previous years. The new category Light duty vehicle, short wheel base includes passenger cars, light trucks,
vans and sport utility vehicles with a wheelbase (WB) equal to or less than
121 inches. The new category Light
duty vehicle, long wheel base
includes large passenger cars, vans, pickup trucks, and sport/utility
vehicles with wheelbases (WB) larger than 121 inches.

The fuel efficiency figures for light duty
vehicles represent the sales-weighted harmonic average of the combined
passenger car and light truck fuel economies.